Codes, Ciphers and Secret Writing (Test Your Code Breaking Skills)

Codes, Ciphers and Secret Writing (Test Your Code Breaking Skills)
Author(s): Martin Gardner
Publisher: Dover Publications
Date : 1984
Pages : 96
Format : PDF
Language : English
ISBN-10 : 0486247619
ISBN-13 : 978-0486247618
Size : 2.24 MB

Description:

Experiment with cryptography - the science of secret writing.

Cipher and decipher codes:

transposition and polyalphabetical ciphers,
famous codes,
typewriter and telephone codes,
codes that use playing cards,
knots, and
swizzle sticks...

even invisible writing and sending messages through outer space. Hours of intrigue and challenge. 45 diagrams.

Code:

http://www.MegaShare.com/3323260